Answer:
F major is the home key of the English horn, the basset horn, the horn in F, the trumpet in F and the bass Wagner tuba. Thus, music in F major for these transposing instruments is written in C major. Most of these sound a perfect fifth lower than written, with the exception of the trumpet in F which sounds a fourth higher.
F major (or the key of F) is a major scale based on F, with the pitches F, G, A, B♭, C, D, and E. Its key signature has one flat: B♭. Its relative minor is D minor and its parallel minor is F minor.
